package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.SignatureAttribute;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPoinCut(){}
    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPoinCut()")
    public void todo(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
        Method method = signature.getMethod();
        AutoFill autoFill = method.getAnnotation(AutoFill.class);//获得方法上的注解对象

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        Object entity = args[0];

        //非空校验，可以没接收到参数
        if(args == null || args.length == 0){
            return;
        }
        //获得数据库操作类型
        OperationType operationType = autoFill.value();
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        try {
            //根据当前不同的操作类型，为对应的属性通过反射来赋值
            if(operationType.equals(OperationType.INSERT)){
                Method setCreateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            }else if(operationType.equals(OperationType.UPDATE)) {
                Method setUpdateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }
}
